Stool seat



FIG. 1 is a perspective view of a stool seat showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top view thereof.

The broken lines in FIG. 1 show environment for illustrative purposesonly and form no part of the claimed design.

CLAIM The ornamental design for a stool seat, as shown and described.